<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>对象</title>
</head>
<body>
    <script>
        var flag=new Boolean(true);
        console.log(flag)

        var mydate=new Date();
        document.write("<h1>"+mydate+"</h1>")
        //var mm=new Math();
        console.log(Math.PI);

        var num=new Number(666);
        console.log(num)

        var a="16";
        parseInt(a);

        console.log(Global.NaN);

    </script>
</body>
</html>